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here are 90 students taking a test. 74 students say that they studied more than an hour. 38 students say that they didn't take a

here are 90 students taking a test. 74 students say that they studied more than an hour. 38 students say that they didn't take a nap the day of the test. 12 students didn't nap and studied less than an hour. How many students both studied more than an hour and took a nap the day of the test

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